The people who got the wealthiest from the California gold rush were the ones selling shovels and tools not the ones mining. When you sell how to do something,

The people who got the wealthiest from the California gold rush were the ones selling shovels and tools not the ones mining. When you sell how to do something, you don’t have to shoulder any of the risk or good luck required to actually make the thing happen. A “how to do something” sale is shorter and more direct than actually doing the thing.